Edited Window Mesh Unable to Move Freely on Wall

Hi friends. I recently edited the model for the RoM "Waning Window" to just have the "top" part of the model. After doing so, I update my bounding box (in Blender) as well as my wall cutouts. This all works great in game, but I am unable to move the new model below a certain point. It looks to be the exact same as the original model. This leads me to believe there's an issue of bounds somewhere, but I'm just speculating. Here's a screencap of what I'm seeing:

Any ideas? Much appreciated.